Can moisture get under vinyl plank flooring?

Author: Winona Rutherford III  |  Last update: Wednesday, November 19, 2025

Excess moisture and water under the flooring can deteriorate and soften vinyl planks. It can also lead to mold growth, setting up a potentially unhealthy indoor environment.

Will water under a vinyl plank floor dry out?

However, in the event of flooding or a bad sewage leak, standing water beneath vinyl plank flooring won't dry out on its own due to too much condensation that has collected between the vinyl planks and substrate or underlayment.

Can you get condensation under vinyl flooring?

What that means to you is that once the moisture is there, it doesn't readily go away, but distributes in the flooring layers. Once it is wet enough the moisture will condense under the vinyl and lay on the belly cloth. That moist environment creates a bad environment for the floor structure.

How do you check for moisture under vinyl flooring?

How Do You Check for Moisture Under Vinyl Flooring? Use moisture meters or conduct a relative humidity (RH) test to check for moisture under vinyl flooring. RH tests involves drilling a hole into the concrete and placing a probe to measure the moisture levels.

Can mold grow under vinyl plank flooring?

Mold Growth: Mold can thrive under vinyl plank flooring due to moisture. Health Risks: Exposure to mold can lead to respiratory issues, allergies, and more serious health conditions. Vinyl Plank Flooring: While durable and versatile, can be a breeding ground for mold if not properly maintained.

🚨 Attention all luxury vinyl plank (LVP) owners! 🚨When water is trapped beneath your LVP flooring.

How to tell if mold is growing under the floor?

One of the most apparent indicators of mold is visible damage to your flooring. Look for: Discoloration: Patches of yellow, green, or black can signal mold growth. Warping: Uneven or bulging floorboards suggest moisture buildup, a breeding ground for mold.

Should I put anything under my vinyl plank flooring?

To get the most out of your LVP you will want to consider what is underneath the flooring. An underlayment provides the proper support to make sure your LVP makes it the long haul.

What happens if you don t put a moisture barrier under vinyl flooring?

When moisture penetrates your flooring, it can cause mold, mildew, and the potential for water damage. A moisture barrier helps control the water vapor's movement to help protect your floors. Therefore, if you're installing floors in an area that sees moisture, even a little, a vapor barrier is needed.

What destroys vinyl plank flooring?

Enemies of Vinyl Flooring
  • Dirt and Grit: Acting like sandpaper, dirt and grit particles can scratch the wear layer of the vinyl, especially at entryways and high-traffic areas. ...
  • Sharp Objects: Dropping sharp objects like knives or tools can puncture or gouge vinyl.

Is it normal to have moisture under laminate flooring?

Even small amounts of moisture, when left unattended, can seep through the seams and cause damage. Humidity: High humidity levels in your home can lead to moisture buildup beneath your laminate flooring. This is particularly common in regions with a humid climate.

How do I get rid of moisture under my floor?

The most common and effective way to do this is by using a dehumidifier in tandem with fans to help draw out the air humidity and excess water quickly. Other common ways to dry out your concrete floor include, but are not limited to: Using a wet vacuum to suck up excess moisture.

Does humidity affect vinyl plank flooring?

Vinyl plank flooring has core components that help resist water damage, but they also fight warping, splitting, and buckling, even under intense humidity.

Do you need to waterproof under vinyl flooring?

This means that whilst normal vinyl flooring is water resistant, it is not waterproof and so a separate membrane system is required. It should be noted that some flooring suppliers have nominally waterproof sheet flooring systems.

How do you stop moisture under vinyl flooring?

Use moisture barriers or underlayment specifically designed for LVP flooring to prevent moisture from seeping up from the subfloor. Proper sealing around the edges and at the joints can also prevent water from penetrating beneath the planks.

Is vinyl plank flooring actually waterproof?

All vinyl plank flooring is naturally water-resistant, as vinyl is a hydrophobic material. While it does well at avoiding damage from household spills or excess moisture from a shower, not all vinyl is entirely waterproof.

Will a dehumidifier remove water from the under floor?

Even though your floor looks dry, chances are moisture is still lurking beneath the surface. Moisture can and will find its way into the cracks and crevices of your hardwood flooring. An easy way to remove moisture from your wood floors is to use a dehumidifier.

Will water ruin vinyl plank flooring?

Vinyl flooring is still a great option for areas that may see some water like bathrooms and kitchens due to their water-resistant properties. But that doesn't mean you can let water sit on vinyl flooring, without cleaning it up. Eventually, water can get into and damage the planks.

Can you put heavy furniture on vinyl plank flooring?

Since most furniture will not go under just one plank, it is perfectly safe for bulky furniture and refrigerators to go on vinyl plank flooring. Vinyl plank flooring will not be damaged or cracked by home appliances' weight due to its strong durability.

Why does my vinyl plank flooring keep separating?

Planks may separate due to factors such as humidity or physical shifting, particularly with click-lock floors. To remedy this issue: Vacuum the gap to remove debris for a tight seam. Use a suction cup and rubber mallet to scoot the board into place.

Should I put something under vinyl plank flooring?

If the vinyl flooring product you choose doesn't have an attached underlayment, you can almost always install directly over the subfloor without one. But to maximize softness, warmth, moisture proofing, and noise reduction, an underlayment is key.

Is moisture under the vapor barrier normal?

Condensation behind vapor barriers with newly built walls is not good, but it is also not uncommon. For moisture to form on your vapor barrier there needs to be a source.

What is the best moisture barrier for vinyl plank flooring?

Moisture and mold protection

A thin foam underlayment made of polyethylene or polypropylene usually works best. If you have an attached pad laminate or vinyl floor, our recommendation is the Sentinel Protect Plus Underlayment. This premium underlayment can be used on, below, and above grade.

Do you need a moisture barrier under vinyl plank flooring on plywood?

Plywood Subfloor: With plywood, an added moisture barrier isn't necessary, but you will want one that offers more comfort and reduces sound noise. Existing Floors: The idea remains the same when installing over plywood, tile, vinyl, and hardwood - the underlayment should provide sound reduction and comfort.

What should you not use on vinyl plank flooring?

Vinyl Flooring “Don'ts”
  • Never use steel wool or abrasive scrubbers to clean your vinyl floor.
  • Avoid using detergents, soaps, abrasive cleaners or products intended to add shine to your floors. ...
  • Don't use wax or solvent-based polishes.
  • Don't use ammonia or ammonia-based cleaning solutions.

Why does my LVP floor crackle when I walk on it?

When you walk on tile, you are pushing it down into the adhesive, and if the tile is not conformed, you are pushing it into contact with the adhesive which causes the clicking/crackling sound. To fix this, you can usually heat the area for at least a day, and then roll the tile using a 100-pound roller.

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